Temperature-alarm



(N Model.)

D. MGDONALD. y

TEMPERATURE ALARM.

N0.s65,399. y Raum-,emana 28, 1887.

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N4 PETERS. Pholulhognphar. washington, DA C.

UNITED STATES PATENT OE-FICEo DONALD MCDONALD, OF LOUISVILLE, KENTUCKY.

TEMPERATURE-ALARM..

SPECIFICATION forming part of Letters VPatent No. 365,399, dated June 28, 1887. lApplication filed December 2B, 1885. Serial No.186,863. (No model.)

To all whom it may concern/.-

Be it known that I, DONALD MoDoNALD, a citizen of the United States, residing at Louisville, in the county of Jeii'erson and' State of Kentucky, have invented certain new and useful Improvements in Temperature-Alarms, of which the following is a specification, reference being had to the accompanying drawings, forming part of this specification, in which-- Figure l is a side elevation of the apparatus, partlyin section; and Fig. 2is an enlarged detail view showing the cock.

The invention will first be described, and

. then specifically pointed out in the claims. v

- A represents a vessel partly filled with mercury or other suitable liquid for supporting the beller air-containing iioat B, into which extends a vertical arm ofthe pipe O, which is open at both ends, the said arm extending to a point about in line'with the top of the vessel A.

D is a casing provided with graduations d, and having a tube, E,lsealed air-tight to the top thereof at its upper end. The tube E is shorter than thecasiug D, and does noty extend to the bottom thereof. Mereuryis placed in the lower part of the casing D and extends up into the tube E, and the air-tight space be` tween the tube and casing above the mercury is filled with alcohol or other suitable volatile liquid. The pipe C extends from the bell or 1 air-iioat B, 4as described, down into the tube E and into the open column of mercury therein for a predetermined distance. Theopen column of mercury is protected from the eiiects of oxidation by means of a small quantity of a deliquescent solution-such as chloride of magnesinm, for instance--which would remain in 4a liquid condition by absorbing moisture from leading into the upper open end of the tube E. The wires are connected with an electric alarm or a key, for a purpose to be presently described.

When the parts are in the positions shown in Fig. 1, and the temperature of the room lowers to a point determined upon, the alcohol will contract Suficiently to allow the column of mercury in the tube E to fall below the lower open end of the pipe O. Thereupon the compressed air contained in the pipe C and bell or air-float B will pass out of said lower open end into and out of the tube E, and the oat will now descend far enough to draw down the long arm of the lever F and release lits short arm from' the proj ection'g, so that the weight-ed lever will fall to the position shown in dotted lines, where it will be supported by a stop, P. This action of the lever G will open the three-way cock H and allow the water from pipes I J to flow out through the .waste-pipe K. Ou the other hand, should the temperature rise to a point determined upon, the alcoholV will expand and force the mercury up through the tube E and touch the wires to close an electric circuit and sound an alarm or turn a key or cock, as the case may be. The apparatus maybe used Without this electrical connection or with it, and, if it isdesired,the casing D and tube E, provided with mercury and alcohol, as described, may be used alone with the electrical devices. In any case it may be said that a connection is formed between an alarm or cock which is put into operation by the open column of mercury and the alcohol contained in a space communicating with the mercury, but otherwise sealed. The apparatus may be again set for operation by raising the ioat above the liquid i n vessel A, so that it will again be filled with air. ver Gr is also raised, its projection g engaging the short arm of supporting-lever F.

Having nowdescribed my invention, what I claim as new, and desire to secure by Letters Patent, is-

The le- IOO l. The combination, inateinperature-alarm, of a easing closed at its upper end, having an open tube projecting down into it and sealed to its upper closed end, mercury bei ng placed in the easing and sealing the lower end ofthe tube, and a volatile liquid in thespace between said tube and casing above the mercury, and connecting devices leading into the upper eml of said tube and connected toa cock or alarm t0 be operated, substantially as set forth.

2. The combination, with an open columir connected at one end to the upper part of the bell or float, and a cock or key having a lever connected to itand supported atits outer en d by the other arm of said supporting-lever, substantially as set forth.

4. The combination, with au open column or body of iinid expansible and eontraetible by changes in temperature, and the cock, key, or alarm to be operated, of a bell suspended by compressed air, substantially as described, a pipe leading from the airspace within the bell into the said fluid body or column, and mechanism connecting the said bell with the device to be operated upon a change of temperature, substantially as set forth.

5. The combination, with the casing, the

open tube sealed at its upper end to the top of said casing and projecting therein to a point above its bottom, mercury being placed in said casing and sealing the lower end of the tube, anda volatile fluid in the space between said tube and casing above the mercury, of a fluid-containing vessel and air-bell suspended therein by compressed air, a pipe leading from said ai r-space down into the mercury in said tube, a supporting-lever connectedvto the upper end of the bell, a weighted lever supported at its outer end by said supportinglever, a three-way cock, to which the opposite end of the weighted lever is connected, and hot and cold water pipes and a wastepipe connected by said cock, substantially as set p forth.

G. The combination, in a temperature-alarm, with aliquidcontainingvcssel,a bell supported therein by compressed air, and a cock connected thereto by intermediate mechanism, of a tube containing column of mercury, a pipe leading from the compressed-air space into the tube and scaled by the mercury, and electric wires connected to a key or alarm and leading into the tube above the normal position of the mercury, whereby the mercury in contracting will fall below the tube and cause the bell to operate its connected mechanism, and expansion of the mercury will cause it to. contact with the electric wires and close the electrical circuit, substantially as and for the purpose set forth.

ln testimony whereof I have set my hand this 26th day of December, 1885.

DONALD MUDONA LD.

XVi tn css es:

KENNETH MoDoNALD, Oseau Ruu'rnu. 

